fix(launcher): resolve mixed-language UI in launcher hub and model setup screens

[BerryUIKI]

Description

Fixes mixed-language UI shown in the Launcher Hub and related local model setup screens when the selected locale is English.

• Routes the Launcher Hub diagnostic badge ("系统硬件体检与本地模型部署") through the existing i18n localization system ( ('launcher_badge_hw_setup', lang)).
• Localizes the Hardware Diagnostics & Local Model Setup Wizard (SetupWizardModal.tsx) title, subtitle, and step badges.
• Localizes Model Hub compatibility evaluation badges (CompatibilityBadge.tsx) to prevent leaking Chinese tier labels from the backend.
• Localizes Settings View's Agent & Local LLM setup section and triggers.
• Adds focused tests verifying the affected screens render in English without Chinese leaks when English is selected, while preserving Simplified Chinese when zh-CN is selected.

Ref #139 (leaving #139 open for remaining milestone acceptance criteria).